Hidden from view but ever-vigilant, Koth, the Keeper of the Hearth, is tasked with protecting the children of the house from the evil creatures that lurk within the chimney stack. Aided by his best friend, Rhyming Sid, a mischievous and agile Rath Dragon who communicates solely in rhyme, Koth works tirelessly to keep the home safe.

On most days, the friends contentedly munch on bark and playfully chase the relatively harmless Monsoots and Mortar Mice that inhabit the chimney. However, when peculiar sounds emanate from the top of the chimney, Koth and Rhyming Sid make a startling discovery: a Skillius has taken up residence in the loft.

Concerned for the well-being of the children and their own safety, Koth and Rhyming Sid set out on a perilous quest that will put their courage and wit to the test as they devise a plan to banish the malevolent Skillius from the house. But as they soon learn, even the best-laid plans can go awry, leading to explosive confrontations with their feathered adversary.